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The Nature of the Free-Stream Conditions Approaching an Oscillating Body in a Low Speed Wind Tunnel

Published online by Cambridge University Press:  07 June 2016

B. W. Roberts
B. W. Roberts*
Affiliation:
Department of Mechanical Engineering, University of Sydney
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Summary

When correcting the measured unsteady aerodynamic forces experienced by an oscillating body for wind-tunnel interference, it is customary to assume that the free-stream conditions ahead of the model are invariant with time. For small, streamlined models oscillating with small amplitudes this assumption is substantially correct. However, for large variations in the drag force on the oscillating body this assumption is imprecise, particularly at low frequency parameters. In the present paper the flow at stations a long way removed from the body section is examined on the basis of the unsteady form of the Bernoulli equation. The predicted free-stream fluctuations are found to be in agreement with experiment.

Type
Research Article
Information
Aeronautical Quarterly , Volume 17 , Issue 4 , November 1966 , pp. 395 - 406
Copyright
Copyright © Royal Aeronautical Society. 1966

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References

1. Durand, E. (Editor.) Aerodynamic theory, Vol. III. Springer, Berlin, 1935.Google Scholar
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5. Jones, W. P. Wind tunnel wall interference effects on oscillating aerofoils in subsonic flow. ARC R & M 2943, 1957.Google Scholar